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stage2: implement Value.eql for void, null and types

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Vexu 2020-10-12 13:13:14 +03:00
parent 7e2774367e
commit 2c12f4a993
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1 changed files with 97 additions and 5 deletions
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102
src/value.zig
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@ -1233,12 +1233,23 @@ pub const Value = extern union {
}
pub fn eql(a: Value, b: Value) bool {
if (a.tag() == b.tag() and a.tag() == .enum_literal) {
const a_name = @fieldParentPtr(Payload.Bytes, "base", a.ptr_otherwise).data;
const b_name = @fieldParentPtr(Payload.Bytes, "base", b.ptr_otherwise).data;
return std.mem.eql(u8, a_name, b_name);
if (a.tag() == b.tag()) {
if (a.tag() == .void_value or a.tag() == .null_value) {
return true;
} else if (a.tag() == .enum_literal) {
const a_name = @fieldParentPtr(Payload.Bytes, "base", a.ptr_otherwise).data;
const b_name = @fieldParentPtr(Payload.Bytes, "base", b.ptr_otherwise).data;
return std.mem.eql(u8, a_name, b_name);
}
}
if (a.isType() and b.isType()) {
// 128 bytes should be enough to hold both types
var buf: [128]u8 = undefined;
var fib = std.heap.FixedBufferAllocator.init(&buf);
const a_type = a.toType(&fib.allocator) catch unreachable;
const b_type = b.toType(&fib.allocator) catch unreachable;
return a_type.eql(b_type);
}
// TODO non numerical comparisons
return compare(a, .eq, b);
}
@ -1656,6 +1667,87 @@ pub const Value = extern union {
};
}
/// Valid for all types. Asserts the value is not undefined.
pub fn isType(self: Value) bool {
return switch (self.tag()) {
.ty,
.int_type,
.u8_type,
.i8_type,
.u16_type,
.i16_type,
.u32_type,
.i32_type,
.u64_type,
.i64_type,
.usize_type,
.isize_type,
.c_short_type,
.c_ushort_type,
.c_int_type,
.c_uint_type,
.c_long_type,
.c_ulong_type,
.c_longlong_type,
.c_ulonglong_type,
.c_longdouble_type,
.f16_type,
.f32_type,
.f64_type,
.f128_type,
.c_void_type,
.bool_type,
.void_type,
.type_type,
.anyerror_type,
.comptime_int_type,
.comptime_float_type,
.noreturn_type,
.null_type,
.undefined_type,
.fn_noreturn_no_args_type,
.fn_void_no_args_type,
.fn_naked_noreturn_no_args_type,
.fn_ccc_void_no_args_type,
.single_const_pointer_to_comptime_int_type,
.const_slice_u8_type,
.enum_literal_type,
.anyframe_type,
.error_set,
=> true,
.zero,
.one,
.empty_array,
.bool_true,
.bool_false,
.function,
.variable,
.int_u64,
.int_i64,
.int_big_positive,
.int_big_negative,
.ref_val,
.decl_ref,
.elem_ptr,
.bytes,
.repeated,
.float_16,
.float_32,
.float_64,
.float_128,
.void_value,
.enum_literal,
.@"error",
.empty_struct_value,
.null_value,
=> false,
.undef => unreachable,
.unreachable_value => unreachable,
};
}
/// This type is not copyable since it may contain pointers to its inner data.
pub const Payload = struct {
tag: Tag,